Refetch causes _this2.options.variables.call is not a function

[teetlaja]

Describe the bug When trying to get next posts from WPGraphql, then refetch fails

methods: {
    showMore() {
      this.offset += this.size
      this.$apollo.queries.posts.refetch({
        size: 6,
        offset: 6,
      })
    },
  },

Initial graphQL post request is working, its like this:

apollo: {
    posts: {
      query: gql`
        query Posts($size: Int, $offset: Int) {
          posts(where: { offsetPagination: { size: $size, offset: $offset } }) {
            pageInfo {
              offsetPagination {
                hasMore
                hasPrevious
                total
              }
            }
            nodes {
              id
              title
              excerpt
              uri
              featuredImage {
                node {
                  srcSet
                }
              }
              categories {
                nodes {
                  name
                }
              }
            }
          }
        }
      `,
      variables() {
        return {
          size: this.size,
          offset: this.offset,
        }
      },
    },
  },
}

I\m also having everything in data described and initial loading is okay but getting next posts is not working

  data() {
    return {
      size: 6,
      offset: 0,
      showMoreEnabled: true,
    }
  },

Expected behavior To change my state with new posts. Pagination is needed, fetchMore is out of question because it shows too much posts finally.

Versions nuxt: 2.14.12 @nuxtjs/apollo: 4.0.1-rc5